Abstract
A two-dimensional photonic crystal asymmetric Mach-Zehnder filter (AMZF) based on the self-collimation effect is studied by numerical simulations and experimental measurements in microwave region. A self-collimated beam is effectively controlled by employing line-defect beam splitters and mirrors. The measured transmission spectra at the two output ports of the AMZF sinusoidally oscillate with the phase difference of pi in the self-collimation frequency range. Position of the transmission peaks and dips can be controlled by varying the size of the defect rod of perfect mirrors, and therefore this AMZF can be used as a tunable power filter.
Highlights
Photonic crystals (PCs) are multidimensional periodic structures with periods of the order of electromagnetic wavelengths that can be designed by the photonic band theory [1]
We propose a design of a 2D PC asymmetric Mach-Zehnder filter (PCAMZF) based on the self-collimation effect in a 2D PC and experimentally demonstrate its transmission characteristics in microwave region
It clearly displays that if the two light beams of frequencies f1 and f2 are synchronously inserted into the input port, the proposed PC-AMZF can separate them into two groups such that the light beam of frequency f1 is emitted through port 1 and that of the frequency f2 through port 2
Summary
Photonic crystals (PCs) are multidimensional periodic structures with periods of the order of electromagnetic wavelengths that can be designed by the photonic band theory [1]. The most important property of PCs is the existence of photonic bandgaps (PBGs) in which light propagation is completely prohibited in any direction [2]. Since PBGs of a PC provide a powerful way to control wave propagation, PCs have several potential applications to photonic integrated circuits (PICs) [3,4]. Light can be controlled to propagate without diffraction along the incident direction of the source beam, which is called the selfcollimation phenomenon of light in PCs [5,6]. Self-collimated beams can be crossed without cross talk, optical devices based on the self-collimating property of light beams in PCs have potential for high density PICs
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